Posted by **anjelica318** on Saturday, December 13, 2008 at 6:52pm.

how do i verify these?

1-sin^2B

1. ----------- = csc^2B-sec^2B

sin^2Bcos^B

2. cos(2a+a) = 4cos^3a-3cosa

- trigo -
**drwls**, Saturday, December 13, 2008 at 9:52pm
1. What exponent goes between ^ and cos? If it is 2, I do not believe the identity is valid as written.

What IS valid is

1/sin^2 B - sin^2B/(sin^2B cos^2 B) =

csc^2 B - sec^2 B

or

[cos^2 B - sin^2 B]/[sin^2B cos^2B ] =

csc^2 B - sec^2 B

- trigo -
**Anonymous**, Sunday, December 14, 2008 at 1:35am
1. (1-sin²B)/(sin²Bcos²B)= csc²B-sec²B

--that's really the given. please help.

## Answer this Question

## Related Questions

- verifying trigonometric identities - How do I do these problems? Verify the ...
- Alg2/Trig - Find the exact value of the trigonometric function given that sin u...
- Trigonometry - Hello all, In our math class, we are practicing the trigonometric...
- Trigonometry - Verify the identities. 1.) √1-COSθ/1+COSθ= 1+SIN...
- math - Proving Trigonometric Identities 1. sec^2x + csc^2x= (sec^2 x)(csc^2 x) 2...
- Trigonometry - Verify the identities. 1.) SIN[(π/2)-X]/COS[(π/2)-X]=...
- Pre-Calculus - I don't understand,please be clear! Prove that each equation is ...
- Confused! Pre-Cal - Verify that each equation is an identity.. tan A= sec a/csca...
- Pre-Calculus - Prove that each equation is an identity. I tried to do the ...
- Trig - Solve in terms of sine and cosine: sec(x) csc(x)- sec(x) sin(x) so far I ...

More Related Questions